Nine HTTP Edge Cases Every API Developer Should Understand

The article describes subtle yet dangerous HTTP behaviors that often catch API developers off guard. It covers issues such as complex Range header parsing that can overload servers (as in a Rack vulnerability), inconsistent Content-Type enforcement across frameworks, malformed Accept header negotiation, missing “Allow” headers in 405 responses, compression applied at unexpected layers, character encoding mismatches corrupting data, path traversal flaws, unbounded request sizes leading to DoS, and request smuggling via conflicting Transfer-Encoding and Content-Length headers. It also highlights differences introduced by HTTP/2 and HTTP/3 and argues that while frameworks handle much of HTTP correctly, developers still need to know which edge cases remain their responsibility to defend against. 

https://blog.dochia.dev/blog/http_edge_cases/

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